package dd.lo.chapter12;

import dd.lo.util.ImageUtils;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.concurrent.Task;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.FlowPane;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
import org.opencv.core.*;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.util.Arrays;

/**
 * Flood fill example
 */
public class Example3 extends Application {

    public static void main(String[] args) {
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        launch(args);
    }

    private static final int DEFAULT_WIDTH = 1080;
    private static final int DEFAULT_HEIGHT = 768;

    private enum Mode {
        ORIGIN,
        FLOOD_FILL,
    }

    private Mat srcImg;

    private ImageView imageView;

    private Point seed;

    private void imageShow(Mode mode) {
        Task<Void> task = new Task<Void>() {
            @Override
            protected Void call() {
                if (null == srcImg) return null;
                Mat dst = new Mat();
                srcImg.copyTo(dst);
                //调整图片大小以用于展示
                ImageUtils.fitImgSize(dst, DEFAULT_WIDTH, DEFAULT_HEIGHT);
                if (null != seed && mode == Mode.FLOOD_FILL) {
                    //lowDiff和highDiff分别是和seed的颜色的差值，设置得比较大的话会忽略较多差异，设置得比较小的话，flood到的区域会比较小
                    //outputRect可以传个空的rect进去，floodFill方法会自动帮你找到能够囊括这个区域的外接矩形
                    Rect outputRect = new Rect();
                    Imgproc.floodFill(dst, new Mat(), seed, new Scalar(0, 0, 255), outputRect, new Scalar(5, 5, 5), new Scalar(5, 5, 5));
//                    System.out.printf("rect: [%d, %d, %d, %d]\n", outputRect.x, outputRect.y, outputRect.width, outputRect.height);
                    Imgproc.rectangle(dst, outputRect, new Scalar(0, 255, 0), 5, Imgproc.LINE_8);
                }
                MatOfByte buffer = new MatOfByte();
                Imgcodecs.imencode(".jpeg", dst, buffer);
                Platform.runLater(() -> imageView.setImage(new Image(new ByteArrayInputStream(buffer.toArray()))));
                return null;
            }
        };
        new Thread(task).start();
    }

    @Override
    public void start(Stage stage) {
        //File chooser
        Button imageChooser = new Button("选择图片");
        imageChooser.setOnMouseClicked(e -> {
            FileChooser fileChooser = new FileChooser();
            fileChooser.setTitle("请选择图片");
            fileChooser.setInitialDirectory(new File(System.getProperty("user.home") + "/Downloads")
            );
            fileChooser.getExtensionFilters().addAll(
//                    new FileChooser.ExtensionFilter("All Images", "*.*"),
                    new FileChooser.ExtensionFilter("JPEG", "*.jpeg"),
                    new FileChooser.ExtensionFilter("WEBP", "*.webp"),
                    new FileChooser.ExtensionFilter("PNG", "*.png"),
                    new FileChooser.ExtensionFilter("JPG", "*.jpg"),
                    new FileChooser.ExtensionFilter("GIF", "*.gif"),
                    new FileChooser.ExtensionFilter("BMP", "*.bmp")
            );
            File imgFile = fileChooser.showOpenDialog(stage);
            if (null == imgFile) {
                System.out.println("用户取消选中文件");
                return;
            }
            //读取一张图片
            srcImg = Imgcodecs.imread(imgFile.getAbsolutePath(), Imgcodecs.IMREAD_UNCHANGED);
            if (srcImg.empty()) {
                throw new RuntimeException("图片读取失败");
            }
            imageShow(Mode.ORIGIN);
        });
        //Origin button
        Button originButton = new Button("原图");
        originButton.setOnMouseClicked(e -> {
            imageShow(Mode.ORIGIN);
        });
        //Exit button
        Button exitButton = new Button("关闭");
        exitButton.setOnMouseClicked(e -> {
            Platform.exit();
        });
        FlowPane bottomControl = new FlowPane();
        bottomControl.getChildren().addAll(imageChooser, originButton, exitButton);
        bottomControl.setPrefHeight(50);
        BorderPane root = new BorderPane();
        imageView = new ImageView();
        imageView.setOnMouseClicked(e -> {
            seed = new Point(e.getX(), e.getY());
            imageShow(Mode.FLOOD_FILL);
        });
        root.setCenter(imageView);
        root.setBottom(bottomControl);
        Scene scene = new Scene(root, DEFAULT_WIDTH, DEFAULT_HEIGHT + 50);
        stage.setScene(scene);
        stage.setTitle("Example3 - Flood fill from the clicked point");
        stage.setResizable(false);
        stage.show();
    }
}
